White LED compared with other light sources: age-dependent photobiological effects and parameters for evaluation

Rebec, Katja Malovrh; Klanjšek-Gunde, Marta; Bizjak, Grega; Kobav, Matej Bernard

doi:10.1080/10803548.2015.1085163

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…Light-emitting diode (LED) lights are commonly used and have the highest efficacy among all current optical sources 17 ; therefore, we used LEDs as a light source. Here, we found that red light altered the amount and the architecture of sleep and wakefulness in mice at intensities of 20 lx or higher during the dark period.…”

Section: Introductionmentioning

confidence: 99%

Red light at intensities above 10 lx alters sleep–wake behavior in mice

Zhang

Wang

et al. 2016

Light Sci Appl

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Sleep is regulated by two mechanisms: the homeostatic process and the circadian clock. Light affects sleep and alertness by entraining the circadian clock, and acutely inducing sleep/alertness, in a manner mediated by intrinsically photosensitive retinal ganglion cells. Because intrinsically photosensitive retinal ganglion cells are believed to be minimally sensitive to red light, which is widely used for illumination to reduce the photic disturbance to nocturnal animals during the dark phase. However, the appropriate intensity of the red light is unknown. In the present study, we recorded electroencephalograms and electromyograms of freely moving mice to investigate the effects of red light emitted by light-emitting diodes at different intensities and for different durations on the sleep–wake behavior of mice. White light was used as a control. Unexpectedly, red light exerted potent sleep-inducing effects and changed the sleep architecture in terms of the duration and number of sleep episodes, the stage transition, and the EEG power density when the intensity was >20 lx. Subsequently, we lowered the light intensity and demonstrated that red light at or below 10 lx did not affect sleep–wake behavior. White light markedly induced sleep and disrupted sleep architecture even at an intensity as low as 10 lx. Our findings highlight the importance of limiting the intensity of red light (⩽10 lx) to avoid optical influence in nocturnal behavioral experiments, particularly in the field of sleep and circadian research.

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Section: Introductionmentioning

confidence: 99%

Red light at intensities above 10 lx alters sleep–wake behavior in mice

Zhang

Wang

et al. 2016

Light Sci Appl

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“…Lighting in classrooms has been researched from various points of view. For instance, some of them have focused either on the energetic efficiency (Li, Cheung, Wong, & Lam, 2010) (Rebec, Klanjsek-Gunde, Bizjak, & Kobak, 2015) (Delvaeye, y otros, 2016), performance, mood, and learning (Knez, 1995) (hygge & Knez, 2001), or understanding and visual comfort (Liu, y otros, 2020) (Noda, Lima, Souza, Leder, & Quirino, 2020) (Fakari, Vahabi, & Fayaz, 2021).…”

Section: Literature Reviewmentioning

confidence: 99%

The importance of lighting quality in university classrooms

Muñoz,

Martínez,

Ayala

et al. 2023

S. F. J. of Dev.

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The study of lighting in learning environments is not a new topic and is not only present in recent research. This work summarizes the current status of the lighting quality at the Instituto Tecnológico de La Laguna, according to the work realized by an external company to the Instituto, in addition to providing some recommendations as claimed by the current legislation, along with the regulations of the accreditation organisms. The results were surprising since the illumination of classrooms seemed adequate in most cases; however, after analyzing said results, it was proven that they were not as adequate as expected. Our main recommendation, predictably, is to increase the quality of illumination to acceptable parameters, considering the opinion of experts in the areas involved such as the cost-benefit ratio to take the illumination to a first level.

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“…It is known that using lighting based on light-emitting diodes the human circadian rhythm can be affected, which may also entail some health effects. It is also known that some of currently used measurement techniques [23,28] and the criteria considered to be appropriate in the design of lighting [33] are mostly not reliable when applied to light-emitting diodes [27,32]. Research groups around the world have consistently shown that the very rapid spread of LED technology in lighting is not correlated with adequately rapid development of measurement techniques, so there are a number of significant problems arising not only from the lack of measuring devices, but also the lack of appropriate indicators reflecting the real impact of lighting conditions, in which the visual work is performed and the influence on people.…”

Section: Introductionmentioning

confidence: 99%

Selected Metrology Problems Implied by the Application of Led Technology in Lighting

Błaszczak

Zając

2016

IAPGOS

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High power LEDs replace traditional light sources in all possible lighting applications, causing significant problems in assessing the quality of lighting. This issue is not limited only to the construction aspects of the measuring equipment, but also has a cognitive dimension. The article presents an overview of the current state of knowledge on color rendering and evaluation of discomfort glare in relation to the widespread use of LEDs in lighting. Some selected parameters developed copyright sources with LED sets. Basic limitations in UGR measurement were indicated.

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White LED compared with other light sources: age-dependent photobiological effects and parameters for evaluation

Cited by 12 publications

References 23 publications

Red light at intensities above 10 lx alters sleep–wake behavior in mice

Red light at intensities above 10 lx alters sleep–wake behavior in mice

The importance of lighting quality in university classrooms

Selected Metrology Problems Implied by the Application of Led Technology in Lighting

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